Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UMLS:C0155339 (Brown)
 12,436 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The DNA as isolated from duck fibroblasts transformed by a duck-adapted Prague strain of Rous sarcoma virus and used for transfection. Transformed recipient BLEF and DEF cultures exhibited considerable morphological variability. The virus designated daPR-RSV-C morphf was obtained from the culture with fusiform transformation and cloned. The virus retained the ability to induce fusiform transformation, even after 20 passages on chicken fibroblasts. There was a good correlation between focus forming activity of the virus and its tumorigenicity in chickens. The frequency of morphf mutation to another phenotype was less than 10(-3) in cloned virus. Foreign avian embryonic cells transformed by this virus clone had a similar morphological appearance as transformed chicken cells. The clone also retained two additional non-conditional markers - subgroup C specificity and the ability to replicate efficiently in duck cells ("duck adaptation"). Freshly obtained cloned virus was found not to contain a transformation-defective mutant. Such a mutant occurred in the second passage of the virus of DEF where the mutant was isolated. Inoculation of the td mutant into Brown Leghorn embryos gave rise to a sarcoma in one of the 36 examined chickens. However, no transforming virus was detected in the sarcoma. SDS-polyacrylamide gel electrophoresis showed that cloned daPR-RSV-C morphf contained only genomic RNA; its molecular weight 3.08 X 10(6) daltons corresponded to the molecular weight of a non-defective PR-RSV-C used as control.
 ...
PMID:Characterization of a mutant of the Prague strain of Rous sarcoma virus inducing fusiform transformation of avian fibroblasts in vitro. 628 73

Transfection of Brown Leghorn embryo fibroblasts (BLEF) and embryo fibroblasts (DEF) was made by means of DNA isolated from RSV-transformed cells. DNA samples were carried out by means of phenol method, according to Svoboda at al. [16, 20] from the tumor sarcoma tissue and from cells transformed in vitro (XC and PR-RSH). DNA samples isolated from cell cultures were used for transfection BLEF and DEF cell cultures. Positive transfection results after the use DNA samples were recorded in BLEF and DEF1 cell cultures. The efficiency of transfection of BLEF is about 30% and for DEF1 10%.
 ...
PMID:Transfection of brown Leghorn embryo fibroblasts (BLEF) and duck embryo fibroblasts (DEF) by means of DNA isolated from RSV-transformed cells. 632 4